It barely announces itself above the surrounding ground level, grading so gently southward that it almost dissolves into the boggy field around it. What it represents, however, is a technology repeated thousands of times across the Irish landscape: a fulacht fia, the remains of a Bronze Age cooking or processing site, built up over time from the discarded burnt stones used to heat water in a sunken trough.

The mechanics of a fulacht fia are straightforward enough. Stones were heated in a fire and then dropped into a water-filled trough, often timber-lined and sunk into the ground near a water source, to bring the water to a boil. The stones cracked with the repeated thermal stress and were thrown aside, gradually forming the characteristic horseshoe or D-shaped mound of shattered, fire-blackened material that survives today. At Moygara, the mound measures approximately 8.5 metres north to south and around 13 metres east to west. It is highest along its northern edge, where it runs close to the field drain, and this positioning beside a reliable water source is entirely typical of the monument type. Two later field ditches have cut into the mound: one running roughly east to west along its northern straight edge, and a second on a northeast to southwest axis slicing through the eastern half. Where these ditches have disturbed the surface, the mound's true character is exposed, with angular stone fragments visible in dense, black, charcoal-rich soil. That eroded northeastern corner may also preserve part of the original trough hollow, the functional heart of the site.

Fulachtaí fia are among the most numerous prehistoric monument types in Ireland, yet this one sits quietly in ordinary farmland, its outline softened by centuries of grass and rush growth, the stream beside it still flowing eastward through its small valley much as it would have done when the site was in use.